Malicious PDF — malware analysis report

Static analysis result for SHA-256 00efb8d00650ce04…

MALICIOUS

PDF

78.9 KB Created: 2021-03-21 05:33:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0ca2578ce1e8a99795f3d40c5daa67b SHA-1: e7daf6dc1595fadb604d35c2a05be17863efc0b7 SHA-256: 00efb8d00650ce0483b690399f5ad5dc7ea3f3f3635bbc7f9595f6fc59790cd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to suspicious domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign, likely using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/award?keyword=bocio+difuso+no+toxico+pdf
    • http://gezakiribonenin.mywebcommunity.org/niwabevijizanulawafevek.pdf
    • http://xoziduso.mypressonline.com/61145535268.pdf
    • http://bezprovodov.guru/folebiwomufebojbifmv.pdf
    • http://maxiteguf.medianewsonline.com/30114366346.pdf
    • http://alcexpress1.xyz/76269661908v5zc0.pdf
    • http://nadahul.ru/zogogtfik0.pdf
    • http://pollsexpert.com/3ds_error_code_51099rgp98.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sudevejerifu/95345127518.pdf
    • https://s3.amazonaws.com/kotodur/why_does_my_keyboard_shortcuts_not_work_in_excel.pdf
    • https://s3.amazonaws.com/silubebebefuju/big_data_black_book_free.pdf
    • https://s3.amazonaws.com/mesotodimus/mikopufofevuxarod.pdf
    • https://s3.amazonaws.com/domegagowevag/giboziziseloribawij.pdf
    • https://s3.amazonaws.com/zizene/bahria_town_karachi_master_plan_map.pdf
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_94edbba8ed9d4815adc5752d8d13a1de.pdf?index=true
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_0e514132a45f48ff87be951217b274e3.pdf?index=true
    • https://s3.amazonaws.com/sobaketemu/athabasca_university_transfer_credit_guide.pdf
    • https://s3.amazonaws.com/negonanopix/alkalinity_drinking_water_guidelines.pdf
    • http://bidusibebawuz.onlinewebshop.net/80085097574.pdf
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_4f3c60c6009945c9886fb601abcc1981.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f44a.bin
0b7ec8fe3582e8dc57b02acd0fbe9212295de9358969c08dd17da8c90679a380		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 4928 bytes
font_01_sfnt_off00010538.bin
7c9c5159612ecb7ebf6163b0ba23df15d30861b1c71c2311db93cba7ec23e91e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10538 12356 bytes

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